Certified Technology Specialist (CTS) Exam 2025 – 400 Free Practice Questions to Pass the Exam

Ultrasonic frequency refers to sound waves that are above the normal hearing range of humans, which is typically from 20 Hz to 20 kHz. Sounds above this frequency, specifically those exceeding 20 kHz, are classified as ultrasonic. This type of sound is not audible to the average human ear, but it can be produced by certain devices like ultrasonic cleaners, medical imaging equipment, and some animal vocalizations, such as those made by bats and dolphins.

The other options do not accurately describe ultrasonic frequencies. Sound within the human hearing range, such as normal conversations or sounds we can hear every day, is below the ultrasonic threshold. Sound used for subwoofers typically refers to lower frequencies, which again does not fall into the category of ultrasonic. Finally, sound that interferes with digital signals is more related to noise and signal integrity rather than the frequency categorization inherent to ultrasonic sound.